哈雷型彗星8 P/Tuttle的不寻常的挥发性成分：解决内部奥尔特云的存在
The unusual volatile composition of the Halley-type comet 8P/Tuttle: Addressing the existence of an Inner Oort Cloud
摘要：
我们测量了有机挥发物（CH 4，CH 3OH，C2 H6，H2 CO），CO和水在彗星8 P/塔特尔，彗星从奥尔特云水库现在在一个短周期哈雷型轨道。我们比较其组成与其他两个彗星在哈雷型轨道，并与彗星的“有机正常”和“有机耗尽”类。在原行星盘的彗星形成区域中，预计会有化学梯度，单个彗星应该反映出其特定的遗产。如果哈雷型彗星像所提出的那样来自内部奥尔特云，我们看不到可以将这些彗星与存储在外部奥尔特云中的彗星区分开来的共同特征。
英文摘要：
We measured organic volatiles (CH4, CH3OH, C2H6, H2CO), CO, and water in comet 8P/Tuttle, a comet from the Oort cloud reservoir now in a short-period Halley-type orbit. We compare its composition with two other comets in Halley-type orbits, and with comets of the "organics-normal" and "organics-depleted" classes. Chemical gradients are expected in the comet-forming region of the proto-planetary disk, and an individual comet should reflect its specific heritage. If Halley-type comets came from the inner Oort cloud as proposed, we see no common characteristics that could distinguish such comets from those that were stored in the outer Oort cloud.
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